CPP Toolchain Flags

Warnings as Errors

The following table lists all warnings that will throw an error by default.

Flags	Status / Default Value
–all-warnings	-Wall
–extra-warnings	-Wextra
-W	-Wextra
-WNSObject-attribute	[enabled]
-Wabbreviated-auto-in-template-arg	[available in C++, ObjC++]
-Wabi	[disabled]
-Wabi-tag	[available in C++, ObjC++]
-Wabi=
-Wabsolute-value	[enabled]
-Waddress	[enabled]
-Waddress-of-packed-member	[enabled]
-Waggregate-return	[disabled]
-Waggressive-loop-optimizations	[enabled]
-Waliasing	[available in Fortran]
-Walign-commons	[available in Fortran]
-Waligned-new=[none|global|all]	[available in C++, ObjC++]
-Wall
-Walloc-size	[enabled]
-Walloc-size-larger-than=<bytes>	9223372036854775807 bytes
-Walloc-zero	[disabled]
-Walloca	[disabled]
-Walloca-larger-than=<number>	9223372036854775807 bytes
-Wampersand	[available in Fortran]
-Wanalyzer-allocation-size	[enabled]
-Wanalyzer-deref-before-check	[enabled]
-Wanalyzer-double-fclose	[enabled]
-Wanalyzer-double-free	[enabled]
-Wanalyzer-exposure-through-output-file	[enabled]
-Wanalyzer-exposure-through-uninit-copy	[enabled]
-Wanalyzer-fd-access-mode-mismatch	[enabled]
-Wanalyzer-fd-double-close	[enabled]
-Wanalyzer-fd-leak	[enabled]
-Wanalyzer-fd-phase-mismatch	[enabled]
-Wanalyzer-fd-type-mismatch	[enabled]
-Wanalyzer-fd-use-after-close	[enabled]
-Wanalyzer-fd-use-without-check	[enabled]
-Wanalyzer-file-leak	[enabled]
-Wanalyzer-free-of-non-heap	[enabled]
-Wanalyzer-imprecise-fp-arithmetic	[enabled]
-Wanalyzer-infinite-loop	[enabled]
-Wanalyzer-infinite-recursion	[enabled]
-Wanalyzer-jump-through-null	[enabled]
-Wanalyzer-malloc-leak	[enabled]
-Wanalyzer-mismatching-deallocation	[enabled]
-Wanalyzer-null-argument	[enabled]
-Wanalyzer-null-dereference	[enabled]
-Wanalyzer-out-of-bounds	[enabled]
-Wanalyzer-overlapping-buffers	[enabled]
-Wanalyzer-possible-null-argument	[enabled]
-Wanalyzer-possible-null-dereference	[enabled]
-Wanalyzer-putenv-of-auto-var	[enabled]
-Wanalyzer-shift-count-negative	[enabled]
-Wanalyzer-shift-count-overflow	[enabled]
-Wanalyzer-stale-setjmp-buffer	[enabled]
-Wanalyzer-symbol-too-complex	[disabled]
-Wanalyzer-tainted-allocation-size	[enabled]
-Wanalyzer-tainted-array-index	[enabled]
-Wanalyzer-tainted-assertion	[enabled]
-Wanalyzer-tainted-divisor	[enabled]
-Wanalyzer-tainted-offset	[enabled]
-Wanalyzer-tainted-size	[enabled]
-Wanalyzer-throw-of-unexpected-type	[enabled]
-Wanalyzer-too-complex	[disabled]
-Wanalyzer-undefined-behavior-ptrdiff	[enabled]
-Wanalyzer-undefined-behavior-strtok	[enabled]
-Wanalyzer-unsafe-call-within-signal-handler	[enabled]
-Wanalyzer-use-after-free	[enabled]
-Wanalyzer-use-of-pointer-in-stale-stack-frame	[enabled]
-Wanalyzer-use-of-uninitialized-value	[enabled]
-Wanalyzer-va-arg-type-mismatch	[enabled]
-Wanalyzer-va-list-exhausted	[enabled]
-Wanalyzer-va-list-leak	[enabled]
-Wanalyzer-va-list-use-after-va-end	[enabled]
-Wanalyzer-write-to-const	[enabled]
-Wanalyzer-write-to-string-literal	[enabled]
-Wany-length	[available in Cobol]
-Wapply-commit	[available in Cobol]
-Warith-conversion	[disabled]
-Warray-bounds	-Warray-bounds=1
-Warray-bounds=<0,2>	1
-Warray-compare	[enabled]
-Warray-parameter	-Warray-parameter=2
-Warray-parameter=<0,2>	2
-Warray-temporaries	[available in Fortran]
-Wassign-intercept	[available in ObjC, ObjC++]
-Wattribute-alias	-Wattribute-alias=1
-Wattribute-alias=<0,2>	1
-Wattribute-warning	[enabled]
-Wattributes	[enabled]
-Wauto-profile	[disabled]
-Wbad-function-cast	[disabled]
-Wbad-line-directive	[available in Cobol]
-Wbad-numeric	[available in Cobol]
-Wbidi-chars	-Wbidi-chars=any
-Wbidi-chars=	unpaired
-Wbinary-long-long	[available in Cobol]
-Wbool-compare	[enabled]
-Wbool-operation	[enabled]
-Wbuiltin-declaration-mismatch	[enabled]
-Wbuiltin-macro-redefined	[enabled]
-Wc++-compat	[disabled]
-Wc++0x-compat	-Wc++11-compat
-Wc++11-compat	[available in C++, ObjC++]
-Wc++11-extensions	[available in C++, ObjC++]
-Wc++14-compat	[available in C++, ObjC++]
-Wc++14-extensions	[available in C++, ObjC++]
-Wc++17-compat	[available in C++, ObjC++]
-Wc++17-extensions	[available in C++, ObjC++]
-Wc++1z-compat	-Wc++17-compat
-Wc++20-compat	[available in C++, ObjC++]
-Wc++20-extensions	[available in C++, ObjC++]
-Wc++23-extensions	[available in C++, ObjC++]
-Wc++26-compat	[available in C++, ObjC++]
-Wc++26-extensions	[available in C++, ObjC++]
-Wc++2a-compat	-Wc++20-compat
-Wc-binding-type	[available in Fortran]
-Wc11-c23-compat
-Wc23-c2y-compat
-Wc90-c99-compat
-Wc99-c11-compat
-Wcall-giving	[available in Cobol]
-Wcall-literal	[available in Cobol]
-Wcalloc-transposed-args	[enabled]
-Wcannot-profile	[enabled]
-Wcast-align	[disabled]
-Wcast-align=strict	[disabled]
-Wcast-function-type	[enabled]
-Wcast-qual	[disabled]
-Wcast-result	[available in D]
-Wcast-user-defined	[available in C++, ObjC++]
-Wcatch-value	-Wcatch-value=1
-Wcatch-value=<0,3>	[available in C++, ObjC++]
-Wcdf-dollar	[available in Cobol]
-Wcdf-invalid-parameter	[available in Cobol]
-Wcdf-name-not-found	[available in Cobol]
-Wchanges-meaning	[available in C++, ObjC++]
-Wchar-subscripts	[enabled]
-Wcharacter-truncation	[available in Fortran]
-Wchkp
-Wclass-conversion	[available in C++, ObjC++]
-Wclass-memaccess	[available in C++, ObjC++]
-Wclobbered	[enabled]
-Wcobol-eject	[available in Cobol]
-Wcobol-resume	[available in Cobol]
-Wcobol-volatile	[available in Cobol]
-Wcomma-subscript	[available in C++, ObjC++]
-Wcomment	[enabled]
-Wcomments	-Wcomment
-Wcomp-6	[available in Cobol]
-Wcomp-x	[available in Cobol]
-Wcompare-distinct-pointer-types	[enabled]
-Wcompare-reals	[available in Fortran]
-Wcomplain-wrong-lang	[enabled]
-Wconditionally-supported	[available in C++, ObjC++]
-Wconversion	[disabled]
-Wconversion-extra	[available in Fortran]
-Wconversion-null	[available in C++, ObjC++]
-Wcopybook-found	[available in Cobol]
-Wcoverage-invalid-line-number	[enabled]
-Wcoverage-mismatch	[enabled]
-Wcoverage-too-many-conditions	[enabled]
-Wcoverage-too-many-paths	[enabled]
-Wcpp	[enabled]
-Wctad-maybe-unsupported	[available in C++, ObjC++]
-Wctor-dtor-privacy	[available in C++, ObjC++]
-Wdangling-else	[enabled]
-Wdangling-pointer	-Wdangling-pointer=2
-Wdangling-pointer=<0,2>	2
-Wdangling-reference	[available in C++, ObjC++]
-Wdate-time	[disabled]
-Wdeclaration-after-statement
-Wdeclaration-missing-parameter-type	[enabled]
-Wdefaulted-function-deleted	[available in C++, ObjC++]
-Wdelete-incomplete	[available in C++, ObjC++]
-Wdelete-non-virtual-dtor	[available in C++, ObjC++]
-Wdeprecated	[enabled]
-Wdeprecated-copy	[available in C++, ObjC++]
-Wdeprecated-copy-dtor	[available in C++, ObjC++]
-Wdeprecated-declarations	[enabled]
-Wdeprecated-enum-enum-conversion	[available in C++, ObjC++]
-Wdeprecated-enum-float-conversion	[available in C++, ObjC++]
-Wdeprecated-literal-operator	[available in C++, ObjC++]
-Wdeprecated-non-prototype
-Wdeprecated-openmp	[enabled]
-Wdeprecated-variadic-comma-omission	[available in C++, ObjC++]
-Wdesignated-init	[enabled]
-Wdisabled-optimization	[disabled]
-Wdiscarded-array-qualifiers	[enabled]
-Wdiscarded-qualifiers	[enabled]
-Wdiv-by-zero	[enabled]
-Wdo-subscript	[available in Fortran]
-Wdouble-promotion	[disabled]
-Wduplicate-decl-specifier	[enabled]
-Wduplicated-branches	[disabled]
-Wduplicated-cond	[disabled]
-Wec-unknown	[available in Cobol]
-Weffc++	[available in C++, ObjC++]
-Welaborated-enum-base	[available in C++, ObjC++]
-Wempty-body	[enabled]
-Wendif-labels	[enabled]
-Wentry-convention	[available in Cobol]
-Wenum-compare	[enabled]
-Wenum-conversion	[enabled]
-Wenum-int-mismatch	[enabled]
-Wequal-assign	[available in Cobol]
-Werror-implicit-function-declaration	-Werror=implicit-function-declaration
-Wexceptions	[available in C++, ObjC++]
-Wexpansion-to-defined	[enabled]
-Wexpose-global-module-tu-local	[available in C++, ObjC++]
-Wextensions	[available in Algol68]
-Wexternal-argument-mismatch	[available in Fortran]
-Wexternal-tu-local	[available in C++, ObjC++]
-Wextra	[enabled]
-Wextra-semi	[available in C++, ObjC++]
-Wfile-code-set	[available in Cobol]
-Wflex-array-member-not-at-end	[disabled]
-Wfloat-conversion	[disabled]
-Wfloat-equal	[disabled]
-Wformat	-Wformat=1
-Wformat-contains-nul	[enabled]
-Wformat-diag	[enabled]
-Wformat-extra-args	[enabled]
-Wformat-nonliteral	[disabled]
-Wformat-overflow<0,2>	-Wformat-overflow=1
-Wformat-overflow=<0,2>	1
-Wformat-security	[disabled]
-Wformat-signedness	[disabled]
-Wformat-truncation	-Wformat-truncation=1
-Wformat-truncation=<0,2>	1
-Wformat-y2k	[disabled]
-Wformat-zero-length	[enabled]
-Wformat=<0,2>	1
-Wframe-address	[enabled]
-Wframe-larger-than=<byte-size>	9223372036854775807 bytes
-Wfree-labels
-Wfree-nonheap-object	[enabled]
-Wfunction-elimination	[available in Fortran]
-Wglobal-module	[available in C++, ObjC++]
-Whardened	[enabled]
-Wheader-guard	[enabled]
-Whidden-declarations=	[available in Algol68]
-Whigh-order-bit	[available in Cobol]
-Whsa	[ignored]
-Wiconv-error	[available in Cobol]
-Wif-not-aligned	[enabled]
-Wignored-attributes	[enabled]
-Wignored-qualifiers	[enabled]
-Wimplicit	[enabled]
-Wimplicit-fallthrough	-Wimplicit-fallthrough=3
-Wimplicit-fallthrough=<0,5>	3
-Wimplicit-function-declaration	[enabled]
-Wimplicit-int	[enabled]
-Wimplicit-interface	[available in Fortran]
-Wimplicit-procedure	[available in Fortran]
-Winaccessible-base	[available in C++, ObjC++]
-Winclude-file-found	[available in Cobol]
-Winclude-file-not-found	[available in Cobol]
-Wincompatible-pointer-types	[enabled]
-Winfinite-recursion	[enabled]
-Winherited-variadic-ctor	[available in C++, ObjC++]
-Winit-list-lifetime	[available in C++, ObjC++]
-Winit-self	[disabled]
-Winline	[disabled]
-Winspect-trailing	[available in Cobol]
-Wint-conversion	[enabled]
-Wint-in-bool-context	[enabled]
-Wint-to-pointer-cast	[enabled]
-Winteger-division	[available in Fortran]
-Winterference-size	[available in C++, ObjC++]
-Wintrinsic-shadow	[available in Fortran]
-Wintrinsics-std	[available in Fortran]
-Winvalid-constexpr	[available in C++, ObjC++]
-Winvalid-imported-macros	[available in C++, ObjC++]
-Winvalid-memory-model	[enabled]
-Winvalid-offsetof	[available in C++, ObjC++]
-Winvalid-pch	[disabled]
-Winvalid-utf8	[disabled]
-Wjump-misses-init	[disabled]
-Wkeyword-macro	[disabled]
-Wlarger-than-
-Wlarger-than=<byte-size>	9223372036854775807 bytes
-Wleading-whitespace=	none
-Wlength-of	[available in Cobol]
-Wlevel-1-occurs	[available in Cobol]
-Wlevel-78	[available in Cobol]
-Wlevel-78-defined	[available in Cobol]
-Wline-truncation	[available in Fortran]
-Wliteral-concat	[available in Cobol]
-Wliteral-suffix	[available in C++, ObjC++]
-Wlocale-error	[available in Cobol]
-Wlogical-not-parentheses	[enabled]
-Wlogical-op	[disabled]
-Wlong-long
-Wlto-type-mismatch	[enabled]
-Wmain	[enabled]
-Wmaybe-musttail-local-addr	[enabled]
-Wmaybe-uninitialized	[enabled]
-Wmemset-elt-size	[enabled]
-Wmemset-transposed-args	[enabled]
-Wmisleading-indentation	[enabled]
-Wmismatched-dealloc	[enabled]
-Wmismatched-new-delete	[available in C++, ObjC++]
-Wmismatched-special-enum	[available in D]
-Wmismatched-tags	[available in C++, ObjC++]
-Wmissing-attributes	[enabled]
-Wmissing-braces	[enabled]
-Wmissing-declarations	[disabled]
-Wmissing-field-initializers	[enabled]
-Wmissing-format-attribute	-Wsuggest-attribute=format
-Wmissing-include-dirs	[disabled]
-Wmissing-noreturn	-Wsuggest-attribute=noreturn
-Wmissing-parameter-name
-Wmissing-parameter-type	[enabled]
-Wmissing-profile	[enabled]
-Wmissing-prototypes	[disabled]
-Wmissing-requires	[available in C++, ObjC++]
-Wmissing-template-keyword	[available in C++, ObjC++]
-Wmissing-variable-declarations	[disabled]
-Wmove-corresponding	[available in Cobol]
-Wmove-index	[available in Cobol]
-Wmove-pointer	[available in Cobol]
-Wmultichar	[disabled]
-Wmultiple-inheritance	[available in C++, ObjC++]
-Wmultiple-parameter-fwd-decl-lists	[enabled]
-Wmultistatement-macros	[enabled]
-Wmusttail-local-addr	[enabled]
-Wnamespaces	[available in C++, ObjC++]
-Wnarrowing
-Wnested-externs	[disabled]
-Wnllanginfo-error	[available in Cobol]
-Wno-alloc-size-larger-than	-Walloc-size-larger-than=18446744073709551615EiB
-Wno-alloca-larger-than	-Walloca-larger-than=18446744073709551615EiB
-Wno-frame-larger-than	-Wframe-larger-than=18446744073709551615EiB
-Wno-larger-than	-Wlarger-than=18446744073709551615EiB
-Wno-stack-usage	-Wstack-usage=18446744073709551615EiB
-Wno-vla-larger-than	-Wvla-larger-than=18446744073709551615EiB
-Wnoexcept	[available in C++, ObjC++]
-Wnoexcept-type	[available in C++, ObjC++]
-Wnon-c-typedef-for-linkage	[available in C++, ObjC++]
-Wnon-template-friend	[available in C++, ObjC++]
-Wnon-virtual-dtor	[available in C++, ObjC++]
-Wnonnull	[enabled]
-Wnonnull-compare	[enabled]
-Wnormalized	-Wnormalized=nfc
-Wnormalized=[none|id|nfc|nfkc]	nfc
-Wnrvo	[available in C++, ObjC++]
-Wnull-dereference	[disabled]
-Wobjc-root-class	[available in ObjC, ObjC++]
-Wodr	[enabled]
-Wold-style-cast	[available in C++, ObjC++]
-Wold-style-declaration	[enabled]
-Wold-style-definition
-Wopenacc-parallelism	[disabled]
-Wopenmp	[enabled]
-Wopenmp-simd	[enabled]
-Woperator-space	[available in Cobol]
-Woverflow	[enabled]
-Woverlength-strings	[disabled]
-Woverloaded-virtual	-Woverloaded-virtual=2
-Woverloaded-virtual=<0,2>	[available in C++, ObjC++]
-Woverride-init	[enabled]
-Woverride-init-side-effects	[enabled]
-Woverwrite-recursive	[available in Fortran]
-Wpacked	[disabled]
-Wpacked-bitfield-compat
-Wpacked-not-aligned	[enabled]
-Wpadded	[disabled]
-Wparentheses	[enabled]
-Wpedantic	[disabled]
-Wpedantic-cast	[disabled]
-Wpedantic-param-names	[disabled]
-Wpessimizing-move	[available in C++, ObjC++]
-Wplacement-new	-Wplacement-new=1
-Wplacement-new=<0,2>	[available in C++, ObjC++]
-Wpmf-conversions	[available in C++, ObjC++]
-Wpointer-arith	[disabled]
-Wpointer-compare	[enabled]
-Wpointer-sign	[enabled]
-Wpointer-to-int-cast	[enabled]
-Wpragma-once-outside-header	[enabled]
-Wpragmas	[enabled]
-Wpreprocessor-error	[available in Cobol]
-Wprio-ctor-dtor	[enabled]
-Wprocedure-not-found	[available in Cobol]
-Wprocedure-pointer	[available in Cobol]
-Wproperty-assign-default	[available in ObjC, ObjC++]
-Wprotocol	[available in ObjC, ObjC++]
-Wpsabi	[enabled]
-Wrange-loop-construct	[available in C++, ObjC++]
-Wreal-q-constant	[available in Fortran]
-Wrealloc-lhs	[available in Fortran]
-Wrealloc-lhs-all	[available in Fortran]
-Wrecording-mode	[available in Cobol]
-Wredundant-decls	[disabled]
-Wredundant-move	[available in C++, ObjC++]
-Wredundant-tags	[available in C++, ObjC++]
-Wregister	[available in C++, ObjC++]
-Wreorder	[available in C++, ObjC++]
-Wreplace-error	[available in Cobol]
-Wrestrict	[enabled]
-Wreturn-local-addr	[enabled]
-Wreturn-mismatch	[enabled]
-Wreturn-type	[enabled]
-Wreturning-number	[available in Cobol]
-Wscalar-storage-order	[enabled]
-Wscope	[available in Algol68]
-Wsegment	[available in Cobol]
-Wsegment-error	[available in Cobol]
-Wsegment-negative	[available in Cobol]
-Wselector	[available in ObjC, ObjC++]
-Wself-move	[available in C++, ObjC++]
-Wsequence-point	[enabled]
-Wset-locale-to	[available in Cobol]
-Wset-to-locale	[available in Cobol]
-Wsfinae-incomplete	-Wsfinae-incomplete=1
-Wsfinae-incomplete=<0,2>	[available in C++, ObjC++]
-Wshadow	[disabled]
-Wshadow-compatible-local	-Wshadow=compatible-local
-Wshadow-ivar	[available in ObjC, ObjC++]
-Wshadow-local	-Wshadow=local
-Wshadow=compatible-local	[disabled]
-Wshadow=global	-Wshadow
-Wshadow=local	[disabled]
-Wshift-count-negative	[enabled]
-Wshift-count-overflow	[enabled]
-Wshift-negative-value
-Wshift-overflow	-Wshift-overflow=1
-Wshift-overflow=<0,2>	-1
-Wsign-compare	[enabled]
-Wsign-conversion	[disabled]
-Wsign-promo	[available in C++, ObjC++]
-Wsized-deallocation	[available in C++, ObjC++]
-Wsizeof-array-argument	[enabled]
-Wsizeof-array-div	[enabled]
-Wsizeof-pointer-div	[enabled]
-Wsizeof-pointer-memaccess	[enabled]
-Wstack-protector	[disabled]
-Wstack-usage=<byte-size>	9223372036854775807 bytes
-Wstop-number	[available in Cobol]
-Wstray-indicator	[available in Cobol]
-Wstrict-aliasing
-Wstrict-aliasing=<0,3>	3
-Wstrict-flex-arrays	[disabled]
-Wstrict-null-sentinel	[available in C++, ObjC++]
-Wstrict-overflow
-Wstrict-overflow=<0,5>	1
-Wstrict-prototypes	[disabled]
-Wstrict-selector-match	[available in ObjC, ObjC++]
-Wstring-compare	[enabled]
-Wstringop-overflow	-Wstringop-overflow=2
-Wstringop-overflow=<0,4>	2
-Wstringop-overread	[enabled]
-Wstringop-truncation	[enabled]
-Wstyle	[disabled]
-Wsubobject-linkage	[available in C++, ObjC++]
-Wsuggest-attribute=cold	[disabled]
-Wsuggest-attribute=const	[disabled]
-Wsuggest-attribute=format	[disabled]
-Wsuggest-attribute=malloc	[disabled]
-Wsuggest-attribute=noreturn	[disabled]
-Wsuggest-attribute=pure	[disabled]
-Wsuggest-attribute=returns_nonnull	[disabled]
-Wsuggest-final-methods	[disabled]
-Wsuggest-final-types	[disabled]
-Wsuggest-override	[available in C++, ObjC++]
-Wsurprising	[available in Fortran]
-Wswitch	[enabled]
-Wswitch-bool	[enabled]
-Wswitch-default	[disabled]
-Wswitch-enum	[disabled]
-Wswitch-outside-range	[enabled]
-Wswitch-unreachable	[enabled]
-Wsync-nand	[enabled]
-Wsynth	[ignored]
-Wsystem-headers	[disabled]
-Wtabs	[available in Fortran]
-Wtarget-lifetime	[available in Fortran]
-Wtautological-compare	[enabled]
-Wtemplate-body	[available in C++, ObjC++]
-Wtemplate-id-cdtor	[available in C++, ObjC++]
-Wtemplate-names-tu-local	[available in C++, ObjC++]
-Wtemplates	[available in C++, ObjC++]
-Wterminate	[available in C++, ObjC++]
-Wtraditional	[disabled]
-Wtraditional-conversion	[disabled]
-Wtrailing-whitespace	-Wtrailing-whitespace=blanks
-Wtrailing-whitespace=	none
-Wtrampolines	[disabled]
-Wtrigraphs	[enabled]
-Wtrivial-auto-var-init	[disabled]
-Wtsan	[enabled]
-Wtype-limits	[enabled]
-Wundeclared-selector	[available in ObjC, ObjC++]
-Wundef	[disabled]
-Wundefined-do-loop	[available in Fortran]
-Wunderflow	[available in Fortran]
-Wunicode	[enabled]
-Wuninit-variable-checking	[disabled]
-Wuninit-variable-checking=
-Wuninitialized	[enabled]
-Wunknown-pragmas	[enabled]
-Wunreachable-code	[ignored]
-Wunsafe-loop-optimizations	[ignored]
-Wunsuffixed-float-constants	[disabled]
-Wunterminated-string-initialization	[enabled]
-Wunused	[enabled]
-Wunused-but-set-parameter	-Wunused-but-set-parameter=3
-Wunused-but-set-parameter=<0,3>	1
-Wunused-but-set-variable	-Wunused-but-set-variable=3
-Wunused-but-set-variable=<0,3>	1
-Wunused-const-variable	-Wunused-const-variable=2
-Wunused-const-variable=<0,2>	1
-Wunused-dummy-argument	[available in Fortran]
-Wunused-function	[enabled]
-Wunused-label	[enabled]
-Wunused-local-typedefs	[enabled]
-Wunused-macros	[disabled]
-Wunused-parameter	[available in Modula-2]
-Wunused-result	[enabled]
-Wunused-value	[enabled]
-Wunused-variable	[enabled]
-Wusage-typename	[available in Cobol]
-Wuse-after-free	-Wuse-after-free=1
-Wuse-after-free=<0,3>	2
-Wuse-without-only	[available in Fortran]
-Wuseless-cast	[disabled]
-Wvarargs	[enabled]
-Wvariadic-macros	[disabled]
-Wvector-operation-performance	[disabled]
-Wverbose-unbounded	[disabled]
-Wvexing-parse	[available in C++, ObjC++]
-Wvirtual-inheritance	[available in C++, ObjC++]
-Wvirtual-move-assign	[available in C++, ObjC++]
-Wvla
-Wvla-larger-than=<number>	9223372036854775807 bytes
-Wvla-parameter	[enabled]
-Wvoiding	[available in Algol68]
-Wvolatile	[available in C++, ObjC++]
-Wvolatile-register-var	[enabled]
-Wwrite-strings	[disabled]
-Wxor-used-as-pow	[enabled]
-Wzero-as-null-pointer-constant	[disabled]
-Wzero-length-bounds	[enabled]
-Wzerotrip	[available in Fortran]
-frequire-return-statement	[available in Go]